Alternating-current magnet



UNITED STATES PATENT email.

HARRY F. STRATTON, OF CLEVELAND, OHIO, ASSIGNOR TO THE ELECTRICCONTROLLER & MANUFACTURING COMPANY, OF ,CLE

VELAND, OHIO, A CORPORATION OF OHIO.

ALTERNATING-CURRENT MAGNET.

Specification of Letters Patent.

Application filed October 14, 1918. Serial No. 257,937.

To (ZZZ-107L011 it may concur/1.:

Be it known that I, HARRY F. S'rna'r'rox, a citizen of the UnitedStates, residing at Cleveland, in the county of Cuyahoga and State'ofOhio, have invented new and useful Improvements in Alternating-CurrentMagnets, 'of which the following is a specification.

My invention relates to alternating cur rent magnets, and moreparticularly to means and methods of preventing the chattering of thearinat ures of such magnets on their pole .faces.

It is necessary that there be intimate and unyielding engagement betweenthe armature and the pole-faces of an alternating current magnet-Whenthey are in the closed position. Chattering will occur and increase to adangerous extent if intimate and continuous engagement betweentheseparts does not exist; and, in addition. the current taken bythearmature-operating winding will increase as the air-gap between thearmature and pole-p1eces becomes alppreciably large. The current mayunder such a condition increase to such an extent that the Winding willbe burned out. Therefore,it is necessary, .not only from thestandpoint'of quiet running and absence of vibration or chattering, butalso of preventing the winding from becoming overheated, that thearmature of alternating current magnets should engage their polefacesintimately and accurately. It is difficult to secure intimate andaccurate engagement of the armature and pole-facesof such magnetswithout very expensive machine work. It has required as much time as twohours to adjust the main operating magnet shown on my Patent, No.1,225,687, granted May 8, 1917, so that it becomes noiseless whenattached to the compensator frame as indicated in the said patent. It isthe object of the present invention to provide a very cheap, simple, andefficient means and method-whereby the time required for suchadjustments may be greatly reduced and an intimate and accurate engagement may-be brought about and main-' tained between theyarmaturesand the polefaces of alternating current magnets.

Referring to the accompanying drawing which shows substantially the mainmagnet disclosed in my said patent, Figure 1 is a side view with partsin section illustrating one form of my invention, and Fig. 2 is a rearor right-hand,elevation'of Fig. 1. Fig. .3 is a view similar to Fig. 1but with the armature loosely mounted on the frame 7 I I 1 designatesthe armature of an alternatingcurrent magnet, pivoted on'the pin 2beneath its lower end. 3 is the U-shaped magnet core, having thepole-faces 4 arranged to be engaged by the adjacent face of the armatlne. 2 being'the energizing winding on the lower leg of the core. It hasthe metal strips 5 welded to its back surface. These strips haye theirback faces machined so as to be asjnearly as possible parallel with thepole-faces 4i. faces lie against the machined surfaces 6 on the front ofthe base or frame 7.

The studs 8 extend through the frame 7 and are screwed into tapped holesin the strips 5.- The nuts 9 on the outer ends of the studs are screwedinto engagment with the back of the frame 7 to secure the core 3 inplace. The metal plate 10 has the holes 11 arranged to 'be received bythe studs8. This plate with the studs-8 in the holes 11 is placed justback of the nuts .9, asshown Patented Feb.1 7,- :roao.

These back on Fig. 1. The nuts 12 on the studs 8 are down tightlyagainst the outer face of the plate to lock the studs 8 and the nuts 9from accidentally turning.

The nuts 9 being drawn up tightly against the frame 7, current isapplied to the magnet winding 2, which causes the armature 1 to be drawnagainst the polepieces'4. If the magnet is silent, the nuts 12 aretightened-up against the plate 10, clamping the studs 8, the plate 10,and the nut-s9 and llinto a relatively fixed relation, and therebypreventing any chan e in the adjustment of the pole-pieces 4 wit'respect to the armature 1. If, however, the magnet chatters when currentis first ad'- mitted to the winding, one of the nuts 9, sometimes theupper and sometimes the lower one, is first loosened until the ma ietbecomes quiet. Occasionally, it is necessary to'loosen both nuts 9 tomake the magnet quiet. When the adjustment of one or both of the nuts 9has made the magnet noiseless, the nuts'12' are tightened the same as ifno adjustment had been required. I found that the precise amount thenuts 9 screwed C. E. BROWN.

AUTOMATIC CONTROLLING oevxce FOR ELECTRIC cmcuns.

APPLICATION FILED MAK.8. 1918.

1,831,231 6. Patented Feb. 17,1920.

3 SHEETS-SHEET I.

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